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Whether or not you really care, there are certain topics that the people in your life will talk to you about that you have to listen to and act interested in because it is just a part of maintaining that relationship. In many cases, it's hearing about people's work life or children. With my mom, it's her dogs (and a thousand other topics). With my dad, it's how much his furniture is worth on ebay (and a thousand other topics). 

With my husband, it's a breakdown of his workout class every Tuesday, Thursday, and Friday morning. He literally came home today and told me how much faster he jump roped (jumped rope?) than everyone else in the class. Unfortunately, I'm getting worse and worse at feigning positive reinforcement. I think he didn't buy it when I smiled and said, "That's so great."